<template>
  <view>
    <view class="goods-list">
      <view v-for="(goods, i) in goodsList" :key="i" @click="gotoGoodsDetail(goods)">
        <my-goods :goods="goods"></my-goods>
      </view>
    </view>
    
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 定义一个请求对象
        queryObj: {
          query: '',
          cid: '',
          pagenum: 1,
          pagesize: 10
        },
        goodsList: [],
        total: 0,
        isloading: false
      };
    },
    
    onLoad(options) {
      this.queryObj.query = options.query || ''
      this.queryObj.cid = options.cid || ''
      
      
      this.getGoodsList()
    },
    
    // 下拉刷新
    onPullDownRefresh() {
      this.queryObj.pagenum = 1
      this.goodsList = []
      this.total = 0
      this.isloading = false
      
      // 重新发起请求 直接传递 停止下拉刷新的回调函数
      this.getGoodsList(() => uni.stopPullDownRefresh())
    },
    
    // 上拉加载
    onReachBottom() {
      // 判断是否还有下一页数据
      if (this.queryObj.pagenum * this.queryObj.pagesize >= this.total) return uni.$showErrorMsg('数据加载完毕！')
      
      // 判断是否正在请求其它数据，如果是，则不发起额外的请求
      if (this.isloading) return
      
      // 让页码值自增加1
      this.queryObj.pagenum += 1
      this.getGoodsList()
    },
    
    methods: {
      
      async getGoodsList(cb) {
        // 打开节流阀
        this.isloading = true
        const { data: res } = await uni.$http.get('/api/public/v1/goods/search', this.queryObj)
        // 关闭节流阀
        this.isloading = false
        
        // 只要数据请求完毕，就立即按需调用 cb 回调函数
        cb && cb()
        
        if (res.meta.status !== 200) return uni.$showErrorMsg()
        // 为数据赋值：通过展开运算符的形式，进行新旧数据的拼接
        this.goodsList = [...this.goodsList, ...res.message.goods]
        this.total = res.message.total
      },
      
      gotoGoodsDetail(goods) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods.goods_id
        })
      }
      
    }
  }
</script>

<style lang="scss">
 
</style>
